Assertion :Sometimes it happens that when $H_{2} S$ gas is passed into solutions in .dil. HCl, yellowish white turbidity appears. Reason: The yellowish turbidity is due to colloidal sulphur, formed by oxidation of $H_{2} S$ by the presence of $N O_{3}^{-}$ or $N O_{2}^{-} o r S O_{3}^{2 -}$
$H_{2} S + H N O_{3} ⟶ S$ (colloidal)
Before passing $H_{2} S$ gas, solution is boiled so as to decompose these radicals.

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The yellowish turbidity is due to formation of colloidal sulphur. It is formed by oxidation of $H_{2} S$ by the presence of $N O_{3}^{-}$ or $N O_{2}^{-} o r S O_{3}^{2 -}$
$H_{2} S + H N O_{3} ⟶ S$ (colloidal)
To avoid the formation of colloidal sulphur, before passing $H_{2} S$ gas, solution is boiled so as to decompose these radicals.

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